Mitsubishi Electric MELSEC iQ-R Series User Manual page 16

■Turning the power OFF or resetting a CPU module
• When a CPU module is powered OFF or reset while writing data to an SD memory card, the processing to write data to the
SD memory card may not be completed. It may cause a loss of logging data during the processing, corruption of data in the
SD memory card that is being accessed, or occurrence of a file system error. The file is automatically recovered when the
high speed data logger module is powered ON again, but it will not succeed in some cases.
The operation, powering OFF or resetting the CPU module after stopping file access, should be considered. For the
important data, a periodic backup is recommended.
(MELSEC iQ-R High Speed Data Logger Module User's Manual (Startup))
■Removing or replacing an SD memory card
• Make sure to stop file access before ejecting or replacing the SD memory card.
(MELSEC iQ-R High Speed Data Logger Module User's Manual (Startup))
• Not following the procedure may cause a loss of logging data during processing, corruption of data in the SD memory card
that is being accessed, a file system error, or false recognition of the mounting status of the SD memory card.
(MELSEC iQ-R High Speed Data Logger Module User's Manual (Startup))
• If an error occurs on the SD memory card, refer to the following:
(Page 253 Troubleshooting on an SD memory card)
• High speed data logger module settings are saved to the SD memory card. Therefore, the high speed data logger module's
IP address returns to the initial status (192.168.3.3) when the SD memory card is not inserted in the module or when the
power is turned OFF to ON or the CPU module is reset, without the settings written to the SD memory card. When
necessary, read the current settings before ejecting the SD memory card and after replacing the card, promptly write those
settings to the new card.
■SD memory card capacity
• Access speed to the SD memory card is affected by the amount of saved files. In particular, access speed becomes
extremely slow when files are saved up to the capacity limit of the SD memory card. Use the SD memory card maintaining
10% or more free space on the card.
• A minimum size occupied by the files on the hard disk varies depending on the SD memory card capacity. Therefore, the
actual file size and the occupied file size on the hard disk may differ.
■SD memory card diagnostic time
• The high speed data logger module performs diagnostics (file recovery, etc.) of the inserted SD memory card contents at
the times listed below.
When powering OFF to ON or resetting the CPU module
When inserting an SD memory card while the power is ON
• The SD memory card diagnostic time takes longer when there are more files on the card. 100 files takes approximately 5
seconds, and 1000 files takes approximately 10 seconds.
• Saving many files on an SD memory card increases the following time. Delete unnecessary files.
Time until 'SD memory card status' (X1) rises
Time until a high speed data logger module starts processing ('Module READY' (X0) or 'Module operating status' (X5) rises)
■Formatting SD memory card
• Use the format function of Configuration Tool to format an SD memory card.
( Page 221 SD memory card diagnostics)
• Do not format an SD memory card using the format function of Windows
• Do not reset the control CPU or turn the power OFF when formatting an SD memory card.
• High speed data logger module settings are saved to an SD memory card. Therefore, all settings are lost when formatting
the SD memory card. When necessary, read the current settings before formatting, and promptly write those settings after
formatting. The IP address of the high speed data logger module returns to the initial status (192.168.3.3) when turning the
power OFF to ON or when resetting the module without writing the settings to the SD memory card.
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